Insulator



Oct. 1, 1929. w, KEMP-TON. 1,730,327

' INSULATOR Original Filed June 28, 18

INVENTOR ATTORN EY Patented Oct. 1, 1929 UNITED STATES PATENT OFFICE WILLARD H. KEMPTON, OF FOREST HILLS, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA IN SULATOR Original application filed June 28, 1918, Serial No. 242,498. Divided and this application filed December 7, 1923. Serial No. 679,070.

My invention relates to composite molded structures and particularly to composite molded strain insulators.

This application is a division of application Serial No. 242,498, filed June 28, 1918, (now Patent No. 1,506,756 of September 2, 1924) and covers certain specific subject-matter set forth therein.

One ob'ect of my invention is to provide a method 0 making a composite molded strain insulator whereby the manufacture thereof is facilitated and the mechanical and electrical characteristics thereof are improved.

Another object of my invention is to provide a strain insulator that shall be simple and durable in construction, economical to manufacture and eifective in its operation.

In practicing my invention, I provide a strain insulator comprising three interlinked metal members that are assembled in such manner, and so related to each other after assembly, as to facilitate the manufacture of the device and to render it effective in operation.

Figure 1 of the accompanying drawing is a longitudinal sectional view of a strain insulator constructed in accordance with my invention, and

Fig. 2 is a plan view of the structure shown in Fig. 1.

The device comprises in general, a pair of spaced metal terminal members 1 and 2, an intermediate insulating spacing or holding member 3, metal link members 4 and 5, and a body of molded insulating material 6. The metal terminal members 1 and 2, which are similar, are provided with terminal eyelets 7 and 8, respectively, and with adjacent recessed portions 9 for the reception of the holding member 3. Portions 10, projecting laterally from the portions 9, are provided with notches 11 in which the rings 4 are seated.

Each of the rings 4 is preferably entirely covered by a fabric casing 12 which, being pervious, is impregnated with a binder, either separately or by contact with the molding material. therearound a body of moldable material 6 which, when it hardens, unites the metal reinforcing members, the coverings thereof and The assembled device has molded the molding material into a substantially single unitary mass.

In assembling the insulator, the covered rings 4 are placed in position in the notches 11, and the members 1 and 2 are held apart in the position shown. The members 1 and 2 may be thus held either by gripping the eye lets 7 and 8 and forcing them in opposite directions or by placing the member 3 in position. In either case, the members 1, 2 and 4 are thus temporarily held in operative relation while the molding material 6 is applied.

By my invention, a strain insulator is provided that is as strong as the metal in it and that may be manufactured in a simple, expeditious and economical manner.

While I have shown and described a particular form of my invention, changes may be effected therein without departing from the spirit and scope thereof, as set forth in the appended claims.

I claim as my invention:

1. A tension insulator comprising a pair of longitudinally spaced transversely extending metal terminal elements having adjacent centrally-recessed portions, longitudinallyaligned outer-surface end-recessed portions and central terminal attaching portions projecting longitudinally from said outer surfaces, an insulating spacing member having portions in each of said central recesses, a pair of insulated metal members each linking corresponding ends of said transverse elements in the said aligned recesses thereof, and a body of insulating material molded about all of said parts within the outer ends of said attaching portions.

2. A tension insulator comprising longitudinally spaced transversely extending metal terminal elements having adjacent centrally recessed portions intermediate the ends thereof, longitudinally-aligned outer-surface end-recessed portions and terminal-attaching portions for opposite ends of the insulator disposed intermediate said end recesses, an insulating spacing member in said central recesses, insulated metal members each linking corresponding ends of said transverse elements in the said aligned recesses thereof and insulating material about all of said parts within the outer ends of said attaching portions.- v

3. A tension insulator comprising longitudinally spaced transversely extending conducting terminal elements having adjacent centrally recessed portions intermediate the ends thereof, lateral grooves in the farthermost sides thereof at opposite sides of said recessed portions and'terminal-attaching portions intermediate said grooves, an insulating spacing member in said central recesses and insulated metal members each linking corresponding ends of said transverse elements in the said grooves.

4. A tension insulator comprising longitudinally spaced transversely extending conducting terminal elements having lateral grooves in the farthermost sides, adjacent to the ends, thereof and terminal-attaching portions intermediate said grooves, an insulating spacing member between said elements and ring-like metal members insulatingly linkingcorresponding ends of said transverse; elements in said grooves.

5. A tension insulator comprising longitudinallyspaced transversely-extending conducting terminal elements having lateral seats'at the farthermost sides thereof and terminal-attaching means on the longitudinal axis of the insulator connected to said elements, an insulating spacing member between said elements and means including a plurality of ring-like metal members insulatigly linking the elements on said seats.

In testimony whereof, I have hereunto subscribed my name this 26th day of November,

WILLARD H. KEMPTON. 

